How do I stop a toilet flapper from turning?

I have an older toilet (possibly Church Xcite model, That s what s on the toilet seat lid, but can t find a name on the actual toilet)that is leaking at the flapper, but the flapper isn t worn out.. the problem is the whole flapper is rotating on the flush valve and causing it to misalign. Is there something to... show more I have an older toilet (possibly Church Xcite model, That s what s on the toilet seat lid, but can t find a name on the actual toilet)that is leaking at the flapper, but the flapper isn t worn out.. the problem is the whole flapper is rotating on the flush valve and causing it to misalign. Is there something to tighten to stop from turning when the chain is pulled to flush?
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